Bump actions/upload-artifact from 2 to 4 (#905)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v2...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/codecov.yml

@@ -18,7 +18,7 @@ jobs:
       - uses: codecov/codecov-action@v4
         # A codecov token is not needed for public repos if the repo is linked
         # on codecov.io. See https://docs.codecov.com/docs/frequently-asked-questions#where-is-the-repository-upload-token-found
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           name: code-coverage-report
           path: cobertura.xml